I've never been that riled up at a concert before. I dunno if I would. I heard girls carry around extra undergarments, but some people straight up take their bras off, and that'd just be so uncomfortable. Your boobs would be flying all over the place.

But I'll admit, I have cried at many a concert. I got separated from my friends one time, and we all just sobbed in a circle when we found each other afterwards.

Fangirls want their idols to understand that they feel intimately close to them, despite having never met them. I think it's mainiy done to convey their obsession and sexual desires, to try and make themselves seem desirable, even if to the bands / band members it just kind of comes across as revolting.